This document provides an overview of file handling in QBASIC. It discusses writing, reading, updating, and deleting records from external data files. It describes the OUTPUT, INPUT, and APPEND file modes used in QBASIC and defines program and data files. Syntax for the WRITE and INPUT commands to write and read from data files is shown. An example program is provided that writes a student's name, class, and roll number to an external file called "std.txt" by getting input from the user.

1. File Handling
Chapter: 10
Prepared by: Bibash Pokhrel
Computer Teacher
Shubhakamana Academy

2. File Handling in
QBASICFile handling is the process of writing records , reading
records or editing records to/from an external data file. It an
important aspect of programming. It this presentation you are
going to learn ::
1. Writing records to an external data file.
2. Reading records data from an external data file.
3. Updating records to an already created data file.
4. Deleting records from an external data file.
Lets Go…

3. Types of file mode used in QBASIC::
1. OUTPUT:- This mode is used to create a new data file and write the
records in it.
2. INPUT:- This mode is used to open an already existing data file and
read the data from it.
3. APPEND:- This mode is used to open an already existing data file and
add records in it.
Types of file:
1. Program file:- It the file in which you code the program
and execute it
2. Data file:- It is the file in in which the records are stored

4. Some of the syntax used during file handling in QBASIC.
WRITE :- It is used to write the data to the data file.
Syntax:- WRITE #1 , [variable1],[variable2],….[variableN]
INPUT :- It is used to read the data from the data file.
Syntax:- INPUT #1 , [variable1],[variable2],….[variableN]

5. Example 1. WAP to write the data name, class and roll number to an
external file “std.txt” in which data are inputted by the user.
Solution::
CLS
OPEN “std.txt” FOR OUTPUT AS #1
INPUT “Enter name”;n$
INPUT “Enter class”;c
INPUT “Enter roll”;r
WRITE #1,n$,c,r
END
Explanation:- Here an external file “std.txt” is created by using OUTPUT
mode whose file number is 1 and represented by #1. All the variables
are asked to the user by using INPUT. WRITE helps to write the data to
the file. Here data file is called by its file number and followed by the
variables.

6. Thank you